Steam-generator



(No'Model.)

STEAM GENERATOR.

Patented July 24.1894.

Wil-F5555- UNITED STATES l'PATETSVP OFFICE.

Tr-IoMAS L. STURTEvANT AND THOMAS J. STUETEvANT, or QUINoY,

MASSACHUSETTS.

STEAM-GENERATOR.

SPECIFICATION forming part of Letterslatent No. 523,447, dated July 24, l1894.

Application nea september 19,1893. serai No. 485,867. (No model.)

To aZZ whom# may concern.-

Be it known that we, THOMAS L. STURTE- vANT and THOMAS J. STURTEVANT, citizens of the United States, residing at Quincy, in the ,county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Steam-Generators; and we do hereby declare the following to be a full, clear, and exact description ot the invention, suchas will enable others skilled in the art to which it appertains to make and use the same, reference lbeing had to` the accompanying drawings, and to figures of reference marked thereon, which form a part of this specification.

This invention relates to steam generators particularly that class in which the generator proper is composed of tube sections, the tubes forming the walls of the fire-box.

This invention may be considered as relating to an improvement upon that shown in United States Letters Patent No. 487,792, issued in our names on December 13, 1892.

The characteristic features in our improved generator consist in providing a larger oombustion chamber with more heating surface,

'which is exposed in the most effective way to wit: about the tire-box. The .heating surface above the fire is nearly all in horizontal or slightly inclined pipes exposed most effectively to the hot rising gases. Further the quick upiow of the water in the inner water tubes, and its short circuit back to the return pipe insure rapid circulation. p

Other features and operating elements will be further described hereinafter.

The drawings represent in Figure l a side elevation of one of the steam generating sections. Fig. 2 is an inside edge View of a group of sections, the bent tubes being omitted..

Fig. 3 is a front elevation of the generator as an entirety. Fig. 4 is a side elevation in part. Fig. 5 is a vertical sectional elevation of a part of a generating pipe, the return pipe and its inner circulating tube. Fig. 6 is a horizontal cross-section and elevation of a modified construction of a section.

In said drawings 2 represents a steam-generator, as an entirety preferably inclosed by sheet iron casing 3 or otherwise, with grate bars at 4, and a stack at 5. The steam generating portions comprise separate pipe sections 6 adapted for multiplication and preferably connected in Series, as shown. Each section is made up of a casting or fittingl 7,'

which serves as a water leg, and from which v rise two pipes 8, 9, respectively an inner one adapted to serve 'as a steam generating pipe and forms the side walls of the tire-box, and

an outer larger return pipe, so called, whichv acts in part to generate steam but chiefly vto serve as a return for water carriedy over by the generating pipe. To unite these two pipes 8, 9 at the top and to provide for ashort circuit in such manner that the steam and water may be quickly separated, a series of v pipes 10 are provided which form the upper wall of the tire-box, being bent upon themselves, and extending inwardly above the re-box, as shown in the drawings. In the present instance these pipes are three in num-v ber but they may vary in number or si'ze as `circumstances demand, and enter headers Beneath the water legs and united therewith is a pipe 12 termed a waterdrunr. This is preferably situated in the ash-pit, and extends about its walls on three sides, being omitted in front to provide for removal of ashes.

To obtain the steam in a dry condition just connected therewith are in a position to be somewhat protected from the fire. This also insures a cool casing. The water supply pipe is Shown at 16 and the steam discharge at 17. Frequently in generators of this class a steam It will receiver 2O is located in front as shown in Figs.

4 and 5 for convenience in attaching the steam gage and in leading out distributing pipes to various sources.

ICG

In Fig. 6 are shown` fragmentary viewshorizontal section and side elevation-of a modification in the steam generating section. This consists in substituting several small pipes 8' for the single large pipe 8; furthermore in omitting the water-drums, and in lieu thereof uniting the water legs 7 of the several sections. These fittings 7 when so connected serve the same purpose as the water-drum.

The operation of this generator presuming the proper amount of water has been supplied is as follows: Exposure of the steam generating tubes to the direct action of the heat in the lire-box causes rapid production of steam, which rises, passing upward through the bent pipes 10, and escapes into the upper end of the return pipe. The water carried over by the steam is here separated and passed down the return pipe, While the steam is discharged into the steam collecting pipe or drum 13. Such steam as may be created in the return pipe is enabled to escape readily by aid of the inner circulating tube l5. In this way steam may be generated in large quantities and at the same time delivered in a dry condition. Fuither superheating may occur, since the steam collecting pipe being exposed to the hot gases escaping into the stack is kept hot and the steam is thus rendered very dry, and in the best condition for immediate use.

What we claim is- 1. In a steam generator, the combination with a water drum, of a water leg, a vertical steam generating pipe and a return-pipe connected with said leg, a steam and water separator supported by said return pipe, and a series of inwardly projecting steam generating tubes connecting said vertical steam generating pipe and said separator, substantially as described.

2. In a steam generator, the combination with a water drum surrounding the fire box on three sides, of a series of vertical steam generating pipes, in proximity to the combustion chamber, a series of return pipes in the rear of said steam generating pipes, circulating tubes within said return pipes, steam and water separators supported by the latter, water legs common to both generating and return pipes and connecting them with the water drum, and a series of inwardly projecting U-` generating pipes and said separator, and a pipe connecting said separator with a steam drum, substantially as described. y In testimony whereof we affix our signatures in presence of two witnesses.

Tl-IOS. L. STURTEVANT. THOMAS J. STURTEVAN'P. Witnesses:

H. E. LODGE, FRANCIS C. STANWOOD. 

